Chime I will...
"do not install within 12" of a door" technically its about 13" from the door give or take.
I can't speak for every division, but our owners manual (that was in the paperwork packet in the freezer, not sure where the dealer moves it to) says...
"When the unit is first powered up, the CO sensor requires a ten (10) minute initial warm-up period to clean the sensor element and achieve stabilization. The GREEN LED indicator will flash on and off during the 10 minute warm-up period. This unit cannot go into a CO alarm during the warm-up period. To test your unit during the warm-up period, press the test button. See Test Procedure in this manual. After the warm-up period, the GREEN power ON indicator should glow continuously If the ON indicator light does not light, see the section, Trouble-Shooting Guide, in this manual for further information. Do not attempt to fix it yourself."
We use Series 35. I could not find the digital version of the 35, but I did find 70 series and it is attached for you viewing (or sedative) pleasure.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).